CN102606269A - Impedance composite muffler - Google Patents
Impedance composite muffler Download PDFInfo
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- CN102606269A CN102606269A CN2012101097522A CN201210109752A CN102606269A CN 102606269 A CN102606269 A CN 102606269A CN 2012101097522 A CN2012101097522 A CN 2012101097522A CN 201210109752 A CN201210109752 A CN 201210109752A CN 102606269 A CN102606269 A CN 102606269A
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Abstract
The invention relates to a muffler, in particular to an impedance composite muffler, which comprises a primary muffler unit and a secondary muffler unit. The secondary muffler unit is made of lava, a shell encircles to form a cavity of the secondary muffler unit and is divided into an inlet-side cavity and an outlet-side cavity, the primary muffler unit is positioned in the inlet-side cavity and consists of an inner tube, one end of the inner tube is communicated with an inlet, the other end of the inner tube is connected with the secondary muffler unit, an integral row of primary holes is arranged on the inner tube, the inside and the outside of the inner tube are communicated with each other via the primary holes, an airflow channel is disposed on the secondary muffler unit, one end of the airflow channel is communicated with the inlet-side cavity between the inner tube and the shell, and the other end of the airflow channel is communicated with the outlet-side cavity. The impedance composite muffler has the advantages that an excellent muffler performance can be realized by means of combining an expansion muffler effect, a throttling pressure reduction muffler effect and a sound absorption effect, and the impedance composite muffler is convenient in processing and maintenance, low in manufacturing cost and fine in structural performance and aerodynamic performance. The impedance composite muffler is applicable to muffling of exhaust of engines and the like.
Description
Technical field
The present invention relates to silencing apparatus, especially a kind of impedance complex formula silencing apparatus.
Background technique
Silencing apparatus is that a kind of air communication that allows is crossed and the device of attenuate acoustic noise, be installed in the pipeline or the inlet and outlet mouth on.The silencing apparatus performance mainly comprises three aspects: one, acoustic attenuation performance comprises the size and the spectral characteristic of sound deadening capacity; Two, aerodynamic quality is normally represented with the total head difference of silencing apparatus entrance and exit; Three, structural behaviour is meant its boundary dimension, firm degree, maintenance requirement, working life etc.Estimate the performance of above-mentioned three aspects of silencing apparatus, not only interknit but also condition each other, consider that from the acoustic attenuation performance of silencing apparatus the sound deadening capacity in required frequency range is the bigger the better; But must consider the requirement of aerodynamic quality simultaneously, for example: the exhaust silencer of internal-combustion engine, excessive if resistance is decreased, power loss is increased, increase oil consumption, even influence vehicle driving.When taking into account silencing apparatus acoustical behavior and aerodynamic quality, also must consider the requirement of structural behaviour, not only durable, also should avoid situation such as volume is excessive, difficult installation.
The kind of silencing apparatus is a lot, but studies carefully its noise elimination mechanism, mainly comprises following three kinds:
One, dissipative muffler is a kind of energy absorption silencing apparatus, through fixing porous sound-absorbing material on the approach of crossing in air communication, utilizes sound-absorbing porous material that the friction and the damping function of sound wave are converted into heat energy with acoustic energy, reaches the purpose of noise elimination; Sound-absorbing material commonly used has glass fiber, low carbon steel silk screen, felt etc.; According to the difference of sound-absorbing material set-up mode, resistance noise reduction structure commonly used comprises straighttube-type, chip, honeycomb, folded plate type, acoustic streaming formula, elbow, mazy type.
Two, reactive muffler utilizes reflection and the interference effect of sound wave etc., through changing the propagation characteristic of sound wave, hinders acoustic wave energy and outwards propagates, and mainly is suitable for eliminating narrow band noise low, medium frequency, and then effect is relatively poor to wideband high-frequency rate noise; Reactive muffling is divided into expansion chamber and resonance cavate according to noise-cancelling theory, and reactive muffling structure commonly used comprises: import interpolation pipe, outlet interpolation pipe, straight-through perforated pipe, perforated plate, reverse expansion, the reverse contraction.
Three, impedance complex formula silencing apparatus; Pass through the compound formation of appropriate configuration by resistive with two kinds of noise-cancelling theorys of resistance, impedance complex formula silencing apparatus commonly used has " resistive-the expansion chamber combined type " silencing apparatus, " resistive-the resonant cavity combined type " silencing apparatus, " resistive-expansion chamber-the resonant cavity combined type " silencing apparatus and " microperforated panel " silencing apparatus.
Dissipative muffler is applicable to the noise of eliminating middle and high frequency, and noise elimination frequency band wider range, but relatively poor to the noise elimination effect of low-frequency noise; Reactive muffler is applicable to eliminates the Low Medium Frequency noise, but relatively poor to the noise elimination effect of high frequency noise; And impedance complex formula silencing apparatus can obtain the noise elimination effect in the high, medium and low frequency range simultaneously.
Therefore the frequency band broad of I. C. engine exhaust noise adopts impedance complex formula silencing apparatus usually.But because sound-absorbing material is prone to melted by the high-temp waste gas that internal-combustion engine is discharged; Cause working life short; And be prone to by obstructions such as carbon deposit, greasy filth and reduction or lose the noise elimination effect, therefore, be used for internal-combustion engine impedance complex formula silencing apparatus mainly be " microperforated panel " silencing apparatus.Cartridge type silencing apparatus with common is an example, comprises outlet pipe, connection swivel nut, silencing pot and tube core, and outlet pipe connects through being connected swivel nut with silencing pot; Welding diaphragm is divided into a plurality of noise elimination cavities with its inner chamber in the silencing pot, and dividing plate is provided with throttle orifice; The tube core is provided with aperture, is communicated with each noise elimination cavity by the tube core; Constitute the expansion chamber resistant noise elimination structure respectively or the cavate reactive muffling structure that resonates by each noise elimination cavity.During work, high-temp waste gas gets into silencing pot through outlet pipe, because the stopping of dividing plate, air-flow can only pass through from a throttle orifice on the dividing plate and a tube core, so air-flow is through repeatedly compressing, shunt, expand, thus the purpose of realization reduction exhaust noise.But " microperforated panel " silencing apparatus, processed complex, cost is high, and the same problem that is prone to by obstructions such as carbon deposit, greasy filth that exists.
Summary of the invention
Technical problem to be solved by this invention provide a kind of easy to process, cost is low, and can be used for the impedance complex formula silencing apparatus that I. C. engine exhaust is eliminated the noise equally.
The technical solution adopted for the present invention to solve the technical problems is: impedance complex formula silencing apparatus; Comprise housing, surround cavity, the entrance and exit that lays respectively at the gas at the axial two ends of cavity constitute, be installed in the noise elimination unit in the cavity by housing; Said housing comprises the end cap of cylindrical shell and outlet side; Said outlet is arranged on the end cap, and said noise elimination unit comprises one-level noise elimination unit and secondary noise elimination unit; Said secondary noise elimination unit is column or sheet and is processed by pelelith, will surround the cavity that constitutes by housing by secondary noise elimination unit and be divided into inlet side cavity and outlet side cavity; Said one-level noise elimination unit is positioned at the inlet side cavity, comprises the interior pipe that an end and inlet connection, the other end link to each other with secondary noise elimination unit; Permutation has the one-level hole on said inner pipe wall, in the pipe of managing in being communicated with by the one-level hole and outside the pipe; Said secondary noise elimination unit is provided with air-flow path, an end of said air-flow path with the inlet side cavity between interior pipe and the housing be connected, the other end is connected with the outlet side cavity.
Further, said secondary noise elimination unit is column, and said secondary noise elimination unit is provided with the duct, by the interior and air-flow path of pipe pipe in the hole link.
Further, said noise elimination unit comprises three grades of noise elimination unit that are positioned at the outlet side cavity, and said three grades of noise elimination unit are column or sheet and are processed by pelelith; The end cap of said three grades of noise elimination unit and outlet side is close to, and offers through hole on said three grades of noise elimination unit, said through hole one end with between secondary noise elimination unit and the three grades of noise elimination unit the outlet side cavity be connected, the other end and outlet be communicated with.
Further, be provided with holddown spring between said secondary noise elimination unit and three grades of noise elimination unit.
Further, the end cap of said cylindrical shell and outlet side detachably is fixedly connected.
Further, said one-level noise elimination unit comprises intervalve, and said interior pipe, intervalve, housing be suit successively, and pipe is positioned at the intervalve pipe in said; Permutation has second hole on the said intervalve tube wall, by in the pipe of second hole connection intervalve and outside the pipe; Inlet side cavity one end in said between pipe and the intervalve through housings close, the other end through the secondary closed-cell of eliminating the noise; Said air-flow path is connected with the inlet side cavity between intervalve and the housing.
Further, said one-level noise elimination unit comprises the packed layer that is made up of the pelelith fragment, in said packed layer is arranged between pipe and the intervalve in the inlet side cavity.
Further, permutation has blind hole on the annular section that said secondary noise elimination unit is corresponding with packed layer.
Further, the external diameter of said secondary noise elimination unit adapts with cylinder internal diameter, and said air-flow path is arranged on the axial hole on the secondary noise elimination unit or is arranged on the groove on the secondary noise elimination unit side face.
Further, said air-flow path adopts groove, and said groove comprises straight-line groove and the spiral chute that is interconnected, and the adjacent straight wire casing is communicated with through spiral chute.
The invention has the beneficial effects as follows: comprehensive expansion chamber is eliminated the noise, the throttling step-down is eliminated the noise and sound absorption, can realize good acoustic attenuation performance.Simultaneously, volcanic rock has that hole is many, light weight, intensity height, insulation, heat insulation, sound-absorbing, fire prevention, acid resistant alkali, advantage such as corrosion-resistant, pollution-free, "dead", and is therefore durable in use; Overall structure is simple, avoids adopting microperforated panel, and is easy to process, cost is low; And owing to use for a long time when descending, can recover acoustic attenuation performance through the recoil cleaning easily at acoustic attenuation performance, easy to maintenance, so structural behaviour is good.The silencing apparatus cavity is only through secondary noise elimination unit separation, and it is provided with air-flow path, and the inside and outside mean porosities of volcanic rock is about 40%, so aerodynamic quality is superior to existing silencing apparatus.
Because volcanic rock can not melted by the high-temp waste gas that internal-combustion engine is discharged; Simultaneously, porosity ratio is big, is difficult for by obstructions such as carbon deposit, greasy filth, and can easily removes carbon deposit, greasy filth through the method that recoil is cleaned, and therefore can be applicable to the exhausting silencer of internal-combustion engine; In addition, because volcanic rock good adsorption performance can effectively reduce the harmful components in the I. C. engine exhaust.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is the schematic top view of embodiment of the invention secondary noise elimination unit;
Fig. 3 is the axial schematic representation of embodiment of the invention secondary noise elimination unit.
Embodiment
Impedance complex formula silencing apparatus of the present invention, comprise housing 10, by housing 10 surround the cavity that constitutes, the inlet 11 of the gas that lays respectively at the axial two ends of cavity and export 12, be installed in the noise elimination unit in the cavity; Said housing 10 comprises the end cap 15 of cylindrical shell 11 and outlet side, and said outlet 12 is arranged on the end cap 15; Said noise elimination unit comprises one-level noise elimination unit 20 and secondary noise elimination unit 30; Said secondary noise elimination unit 30 is column or sheet and is processed by pelelith, will surround the cavity that constitutes by housing 10 by secondary noise elimination unit 30 and be divided into inlet side cavity 14 and outlet side cavity 13; Said one-level noise elimination unit is positioned at inlet side cavity 14, comprises the interior pipe 22 that an end and inlet 11 connections, the other end link to each other with secondary noise elimination unit 30; Permutation has one-level hole 23 on pipe 22 tube walls in said, by in the pipe of pipe 22 in 23 connections of one-level hole and outside the pipe; Said secondary noise elimination unit 30 is provided with air-flow path, an end of said air-flow path with the inlet side cavity 14 between interior pipe 22 and the housing 10 be connected, the other end is connected with outlet side cavity 13.
According to the throttling decompression principle, when high pressure draught when having the restricting orifice of certain circulation area, pressure is reduced.Gradual change pressure drop under connecting through the multistage throttle orifice plate, just can being separated into the once big sudden change pressure drop of the direct emptying of original high pressure repeatedly.Exhaust sound power is directly proportional with the high power that pressure falls, so change pressure jump into pressure gradual change emptying, just can obtain the noise elimination effect.
When silencing apparatus of the present invention is worked; High-temp waste gas gets into silencing apparatus through outlet pipe; Because stopping of secondary noise elimination unit 30; Inlet side cavity 14 in most of air-flow can only be got into by one-level hole 23 between pipe 22 and the housing 10, the air-flow path through secondary noise elimination unit 30 gets into outlet side cavity 13 then, so air-flow passes through the two-stage throttling of one-level hole 23 and air-flow path respectively; Simultaneously, by air-flow path, outlet side cavity 13 with export 12 and constitute the expansion chamber noise elimination structure.Secondly; Because secondary noise elimination unit 30 is processed by pelelith; And volcanic rock is a kind of porous material; 30 self holes get into outlet side cavity 13 to the fraction air-flow through secondary noise elimination unit, through the effects through the air-flow of air-flow path and himself hole of 30 pairs of secondary noise elimination unit, utilize sound-absorbing porous material that the friction and the damping function of sound wave are converted into heat energy with acoustic energy.
Therefore, the comprehensive expansion chamber of impedance complex formula silencing apparatus of the present invention is eliminated the noise, the throttling step-down is eliminated the noise and sound absorption, can realize good acoustic attenuation performance.Simultaneously, volcanic rock has that hole is many, light weight, intensity height, insulation, heat insulation, sound-absorbing, fire prevention, acid resistant alkali, advantage such as corrosion-resistant, pollution-free, "dead", and therefore impedance complex formula silencing apparatus of the present invention is durable in use; Overall structure is simple, avoids adopting microperforated panel, and is easy to process, cost is low; And owing to use for a long time when descending, can recover acoustic attenuation performance through the recoil cleaning easily at acoustic attenuation performance, easy to maintenance, so structural behaviour is good.The silencing apparatus cavity is only separated through secondary noise elimination unit 30, and it is provided with air-flow path, and the inside and outside mean porosities of volcanic rock is about 40%, so aerodynamic quality is superior to existing silencing apparatus.
Because volcanic rock can not melted by the high-temp waste gas that internal-combustion engine is discharged; Simultaneously, porosity ratio is big, is difficult for by obstructions such as carbon deposit, greasy filth, and can easily removes carbon deposit, greasy filth through the method that recoil is cleaned, and therefore can be applicable to the exhausting silencer of internal-combustion engine; In addition, because volcanic rock good adsorption performance can effectively reduce the harmful components in the I. C. engine exhaust.Instance as shown in Figure 1, promptly a kind of silencing apparatus that is used for the motor exhaust noise elimination, its housing 10 includes the conically shaped 16 of oral-lateral, and inlet 11 is arranged on the vertex of a cone of conically shaped 16.
In pipe 22 can seal through the secondary unit 30 of eliminating the noise, when secondary noise elimination unit 30 was column, acoustically effective was good, but gas permeability is poor; When secondary noise elimination unit 30 in the form of sheets time the, good permeability, but acoustically effective is relatively poor.Therefore further, said secondary noise elimination unit 30 is column, and said secondary noise elimination unit 30 is provided with the duct, by the interior and air-flow path of 22 pipes of pipe in the hole link.The air-flow passing hole channel gets into 30 inside, secondary noise elimination unit, can improve the acoustically effective of secondary noise elimination unit 30; Simultaneously, air-flow gets into air-flow path through the duct, can reduce vapour lock, improves aerodynamic quality, remedies the problem of the secondary noise elimination unit 30 gas permeability differences of column.
In order to improve acoustically effective, the noise elimination unit of being processed by pelelith that is column or sheet more than the one-level can, one-level be set also after eliminating the noise unit 20.As in instance as shown in Figure 1, said noise elimination unit comprises three grades of noise elimination unit 40 that are positioned at outlet side cavity 13, and said three grades of noise elimination unit 40 are processed in the form of sheets and by pelelith; Said three grades of noise elimination unit 40 are close to the end cap 15 of outlet side; Offer through hole 41 on said three grades of noise elimination unit 40, said through hole 41 1 ends with between secondary noise elimination unit 30 and the three grades of noise elimination unit 40 outlet side cavity 13 be connected, the other end and outlet 12 be communicated with.Certain three grades of noise elimination unit 40 also can adopt column, but are unfavorable for the raising of aerodynamic quality and structural behaviour.
Above-mentioned secondary noise elimination unit 30 and three grades of noise elimination unit 40 can adopt bonding etc. being fixed on the housing 10; But in order to improve structural behaviour; Ease of assembly; Best, be provided with holddown spring 50 between said secondary noise elimination unit 30 and three grades of noise elimination unit 40, through the effect of holddown spring 50; Secondary noise elimination unit 30 is spacing fixing with intervalve 21 through interior pipe 22, and three grades of noise elimination unit 40 are spacing fixing through end cap 15.Safeguard for ease; Further, the end cap 15 of said cylindrical shell 11 and outlet side detachably is fixedly connected, and detachable fixed connection can be adopted bolt, clamping etc.; In instance as shown in Figure 1, the end cap of cylindrical shell 11 and outlet side 15 detachably is fixedly connected through screw thread.
As shown in Figure 1, further, said one-level noise elimination unit comprises intervalve 21, said in pipe 22, intervalve 21, housing 10 suit successively, and pipe 22 is positioned at intervalve 21 pipes in said; Permutation has second hole on said intervalve 21 tube walls, by in the pipe of second hole connection intervalve 21 and outside the pipe; Inlet side cavity 14 1 ends in said between pipe 22 and the intervalve are through 30 sealings through secondary noise elimination unit of housing 10 sealings, the other end; Said air-flow path is connected with the inlet side cavity 14 between intervalve 21 and the housing 10.Therefore, air-flow passes through three grades of throttlings of one-level hole 23, second hole and air-flow path respectively, can further improve the effect that the throttling step-down is eliminated the noise.
Further, as shown in Figure 1, said one-level noise elimination unit comprises the packed layer 24 that is made up of the pelelith fragment, in said packed layer 24 is arranged between pipe 22 and the intervalve 21 in the inlet side cavity 14.When air-flow during through the packed layer 24 between interior pipe 22 and the intervalve 21, air-flow can improve acoustically effective by self hole of the pelelith fragment that constitutes packed layer 24 and the Clearance Flow between the fragment when improving throttling step-down noise elimination effect.The volcanic rock structure that packed layer 24 can adopt tubular and barrel to be provided with radial hole and axial bore replaces, but the realization cost of packed layer 24 is lower; Especially cooperate aforesaid holddown spring 50.
Above-mentioned interior pipe 22 can be weldingly fixed on the housing 10 through support with intervalve 21; But safeguard for ease; In instance as shown in Figure 1, pipe 22 was managed interior inward flange 36, is inserted the outward flange 35 between intervalve 21 and the cylindrical shell 11 in said secondary noise elimination unit 30 was provided with and inserts.Interior pipe 22 is weldingly fixed on the housing 10 with intervalve 21 1 ends, the other end supports through inward flange 36 and outward flange 35 respectively; Simultaneously, in holddown spring 50 effect down,, can guarantee compressing of the 30 pairs of packed layers 24 in secondary noise elimination unit, guarantee the cooperation of secondary noise elimination unit 30 simultaneously with interior pipe 22, intervalve 21 through inward flange 36 and outward flange 35.
In order further to improve the gas permeability of secondary noise elimination unit 30, improve the acoustically effective of secondary noise elimination unit 30, permutation has blind hole 39 on the corresponding annular section of said secondary noise elimination unit 30 and packed layer 24.
Above-mentioned air-flow path can adopt multiple structure, as: said secondary noise elimination unit 30 external diameters constitute air-flow path less than cylindrical shell 11 internal diameters by the radial clearance between secondary noise elimination unit 30 and the cylindrical shell 11; The external diameter of perhaps said secondary noise elimination unit 30 adapts with cylindrical shell 11 internal diameters, and said air-flow path is arranged on the axial hole on the secondary noise elimination unit 30 or is arranged on the groove on secondary noise elimination unit 30 side faces.In instance as shown in Figure 1, owing between interior pipe 22 and intervalve 21, adopt packed layer 24, the therefore throughput on intervalve 21 each circumferential position and inconsistent; Therefore like Fig. 2, shown in Figure 3; Said air-flow path adopts groove, and said groove comprises the straight-line groove 38 and spiral chute 37 that is interconnected, and adjacent straight wire casing 38 is communicated with through spiral chute 37; The straight-line groove 38 and the spiral chute 37 that are interconnected help the even distribution of air-flow; Simultaneously, adopt straight-line groove 38 and spiral chute 37, help utilizing interfering and eliminate the noise.
Further; In instance as shown in Figure 1; The duct comprises axial bore 31, first radial hole 32, second radial hole 34, axial groove 33, is communicated with in axial bore 31 1 ends and interior pipe 22 pipes, the other end is communicated with coaxial groove 33 connections of first radial hole, 32 the other ends with first radial hole 32; The coaxial groove 33 of second radial hole, 34 1 ends is communicated with, the other end sealing; The duct is communicated with air-flow path through axial groove 33, constitutes mazy type resistance noise reduction structures through axial bore 31, first radial hole 32, second radial hole 34 and axial groove 33, can further improve the noise elimination effect.
Impedance complex formula silencing apparatus of the present invention, concrete size can design according to actual conditions needs such as noise elimination frequency band, throughputs.Instance as shown in Figure 1, boundary dimension is with reference to having noise eliminator of motorcycle now, cylindrical shell 11 long 500mm, interior pipe 22 and outer tube 21 long 450mm, conically shaped 16 long 100mm, secondary noise elimination unit 30 long 100mm, cylindrical shell 11 internal diameter 100mm; Interior pipe 22 internal diameter 30mm are provided with three row's one-level holes 23 on interior pipe 22 tube walls, the internal diameter in one-level hole 23 is that 6mm, hole pitch are 35mm; Intervalve 21 internal diameters 90 are provided with four row's second holes on intervalve 21 tube walls, the internal diameter of second hole is that 6mm, hole pitch are 55mm; Packed layer 24 fragment particle diameter 10mm, through the engineering experiment actual measurement, the noise elimination effect of this silencing apparatus is suitable with existing noise eliminator of motorcycle, but fuel-economizing 15%～20%, and the harmful components in the tail gas effectively reduce.
Claims (10)
1. impedance complex formula silencing apparatus; Comprise housing (10), surround the cavity that constitutes, the inlet (11) that lays respectively at the gas at the axial two ends of cavity and outlet (12), be installed in the noise elimination unit in the cavity by housing (10); Said housing (10) comprises the end cap (15) of cylindrical shell (11) and outlet side; Said outlet (12) is arranged on the end cap (15), and said noise elimination unit comprises one-level noise elimination unit (20) and secondary noise elimination unit (30); It is characterized in that:
Said secondary noise elimination unit (30) is column or sheet and is processed by pelelith, will surround the cavity that constitutes by housing (10) by secondary noise elimination unit (30) and be divided into inlet side cavity (14) and outlet side cavity (13); Said one-level noise elimination unit is positioned at inlet side cavity (14), comprises the interior pipe (22) that an end and inlet (11) connection, the other end link to each other with secondary noise elimination unit (30);
Permutation has one-level hole (23) on pipe (22) tube wall in said, in being communicated with by one-level hole (23) in the pipe of pipe (22) with pipe outside; Said secondary noise elimination unit (30) is provided with air-flow path, an end of said air-flow path with the inlet side cavity (14) between interior pipe (22) and the housing (10) be connected, the other end is connected with outlet side cavity (13).
2. impedance complex formula silencing apparatus as claimed in claim 1 is characterized in that: said secondary noise elimination unit (30) is column, and said secondary noise elimination unit (30) is provided with the duct, by the interior and air-flow path of pipe (22) pipe in the hole link.
3. impedance complex formula silencing apparatus as claimed in claim 1 is characterized in that: said noise elimination unit comprises the three grades of noise elimination unit (40) that are positioned at outlet side cavity (13), and said three grades of noise elimination unit (40) are column or sheet and are processed by pelelith; Said three grades of noise elimination unit (40) are close to the end cap (15) of outlet side; Offer through hole (41) on said three grades of noise elimination unit (40), said through hole (41) one ends with secondary eliminate the noise between unit (30) and the three grades of noise elimination unit (40) outlet side cavity (13) be connected, the other end and outlet (12) be communicated with.
4. impedance complex formula silencing apparatus as claimed in claim 3 is characterized in that: be provided with holddown spring (50) between said secondary noise elimination unit (30) and the three grades of noise elimination unit (40).
5. impedance complex formula silencing apparatus as claimed in claim 4 is characterized in that: the end cap (15) of said cylindrical shell (11) and outlet side detachably is fixedly connected.
6. like claim 1,2,3,4 or 5 described impedance complex formula silencing apparatuss, it is characterized in that:
Said one-level noise elimination unit comprises intervalve (21), and said interior pipe (22), intervalve (21), housing (10) be suit successively, and pipe (22) is positioned at intervalve (21) pipe in said;
Permutation has second hole on said intervalve (21) tube wall, by in the pipe of second hole connection intervalve (21) and outside the pipe;
Inlet side cavity (14) one ends in said between pipe (22) and the intervalve through housing (10) sealing, the other end through secondary unit (30) sealing of eliminating the noise; Inlet side cavity (14) between same intervalve of said air-flow path (21) and the housing (10) is connected.
7. impedance complex formula silencing apparatus as claimed in claim 6 is characterized in that: said one-level noise elimination unit comprises the packed layer (24) that is made up of the pelelith fragment, and said packed layer (24) is arranged between interior pipe (22) and the intervalve (21) in the inlet side cavity (14).
8. impedance complex formula silencing apparatus as claimed in claim 7 is characterized in that: permutation has blind hole (39) on said secondary noise elimination unit (30) annular section corresponding with packed layer (24).
9. impedance complex formula silencing apparatus as claimed in claim 7; It is characterized in that: the same cylindrical shell of external diameter (11) internal diameter of said secondary noise elimination unit (30) adapts, and said air-flow path is arranged on the axial hole on the secondary noise elimination unit (30) or is arranged on the groove on secondary noise elimination unit (30) side face.
10. impedance complex formula silencing apparatus as claimed in claim 9 is characterized in that: said air-flow path adopts groove, and said groove comprises straight-line groove (38) and the spiral chute (37) that is interconnected, and adjacent straight wire casing (38) is communicated with through spiral chute (37).
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| CN 201210109752 CN102606269B (en) | 2012-04-16 | 2012-04-16 | Impedance composite muffler |
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| CN 201210109752 CN102606269B (en) | 2012-04-16 | 2012-04-16 | Impedance composite muffler |
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Cited By (11)
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| CN103183119A (en) * | 2013-03-14 | 2013-07-03 | 昆明理工大学 | Combined-type anechoic tile |
| CN103183120A (en) * | 2013-03-14 | 2013-07-03 | 昆明理工大学 | Volcanic rock noise elimination tile |
| CN103184726A (en) * | 2013-03-14 | 2013-07-03 | 刘仁栋 | Volcanic rock sound-proof noise barrier |
| CN108836630A (en) * | 2018-06-28 | 2018-11-20 | 广东工业大学 | A kind of noise elimination structure noiseproof earplug |
| CN109958547A (en) * | 2019-03-25 | 2019-07-02 | 哈尔滨工程大学 | A kind of Stirling engine electricity generation system integrating engine exhaust noise elimination |
| CN110145385A (en) * | 2019-06-05 | 2019-08-20 | 湖北富亿农业机械制造有限公司 | A kind of engineering machine engine exhaust muffler |
| CN111058924A (en) * | 2019-11-25 | 2020-04-24 | 航天时代飞鸿技术有限公司 | Two-stroke aero-engine composite silencer and application |
| CN111828130A (en) * | 2020-06-18 | 2020-10-27 | 威迩徕德电力设备(上海)有限公司 | Diesel engine tail gas silencer |
| CN111894717A (en) * | 2020-06-28 | 2020-11-06 | 东南大学 | Exhaust mechanism of CBR600 in-line four-cylinder engine suitable for FSC (diesel fuel cycle) events |
| CN113833698A (en) * | 2021-09-23 | 2021-12-24 | 天长市天粮米业有限公司 | Fan noise reduction device of rice processing equipment |
| CN114108856A (en) * | 2021-11-25 | 2022-03-01 | 南京光声超构材料研究院有限公司 | Fractal sound absorption super-surface unit structure and fractal sound absorption super-surface |
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